808216979 has 12 divisors (see below), whose sum is σ = 840758880. Its totient is φ = 776889120.

The previous prime is 808216931. The next prime is 808217057. The reversal of 808216979 is 979612808.

It is not a de Polignac number, because 808216979 - 2²⁰ = 807168403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (808216909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198989 + ... + 203009.

It is an arithmetic number, because the mean of its divisors is an integer number (70063240).

Almost surely, 2^808216979 is an apocalyptic number.

808216979 is a deficient number, since it is larger than the sum of its proper divisors (32541901).

808216979 is a wasteful number, since it uses less digits than its factorization.

808216979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318 (or 4289 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 808216979 is about 28429.1571982006. The cubic root of 808216979 is about 931.4852664807.

The spelling of 808216979 in words is "eight hundred eight million, two hundred sixteen thousand, nine hundred seventy-nine".